Think of the angst we’ve felt, and wars we’ve waged against squirrels. Seeds “guaranteed” to be tasty only to birds. “Squirrel-proof” bird feeders with new designs each year that are more effective. Just the fact that we’ve named them bird feeders – as if we could declare that the natural world should behave according to our birds-only rules. And, how many of us go batty when we see a squirrel – knocking on windows, or shouting out doors in a short-lived attempt to scare them off?
This I know for sure about my critter feeder. The usual pattern of 3 birds eating and 2 queued on the deck railing gets preempted by the red-headed woodpecker; and, the woodpecker gets preempted by the squirrel.